untitled3.asv

《MATLAB 7.0编程基础》第3章 （源码实例）主要讲解MATLAB的数值计算

clear all
%syms x y;
v = -1:0.02:1;
[x,y] = meshgrid(v);
z = x.^2+2.^y-1;
[px,py] = gradient(z,.02,.02);
quiver(v,v,px,py);
contour(z),hold on, quiver(px,py), hold off